Units
JSBSim uses English units for internal calculations almost exclusively. However, it is possible to input some parameters in the configuration file using different units. In fact, to avoid confusion, it is recommended that the unit always be specified. Units are specified using the unit attribute. For instance, the specification for the wingspan looks like this:
<wingspan unit="FT"> 35.8 </wingspan>
The above statement specifies a wingspan of 35.8 feet. The following statement specifying the wingspan in meters would result in the wingspan being converted to 35.8 feet as it was read in:
<wingspan unit="M"> 10.91 </wingspan>
The two statements for wingspan are effectively equivalent.
The following units are currently supported in JSBSim:
Length
unit= |
unit |
|---|---|
FT |
ft |
IN |
in |
M |
m |
KM |
km |
Area
unit= |
unit |
|---|---|
M2 |
m² |
FT2 |
ft² |
Volume
unit= |
unit |
|---|---|
FT3 |
ft³ |
CC |
cm³ |
M3 |
m³ |
LTR |
l |
Mass and Weight
unit= |
unit |
|---|---|
LBS |
lbm |
KG |
kg |
Moments of Inertia
unit= |
unit |
|---|---|
SLUG*FT2 |
slug ft² |
KG*M2 |
kg m² |
Angles
unit= |
unit |
|---|---|
RAD |
rad |
DEG |
deg |
Spring Force
unit= |
unit |
|---|---|
N/M |
N/m |
LBS/FT |
lb/ft |
Damping Force
unit= |
unit |
|---|---|
N/M/SEC |
N/(m s) |
LBS/FT/SEC |
lb/(ft s) |
Power
unit= |
unit |
|---|---|
WATTS |
W |
HP |
Hp |
Force
unit= |
unit |
|---|---|
LBS |
lb |
N |
N |
Velocity
unit= |
unit |
|---|---|
KTS |
kts |
FT/SEC |
ft/s |
M/S |
m/s |
Torque
unit= |
unit |
|---|---|
N*M |
N m |
FT*LBS |
lb ft |
Pressure
unit= |
unit |
|---|---|
PSF |
lb/ft² |
PSI |
lb/in² |
ATM |
atm |
PA |
N/m² |
INHG |
in HG |